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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30b04f69dad9908877ca9ea957a4b67f426b1b80e393a54e25fb512ac3ac6f9c' 
  AND token = 'Hhw3F60G3kaUtvWmQPo1wV+bTu8Bb+Nm+Gkj9DeM2q8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}